Istanbul (CNN)The suicide bomber who killed at least 10 foreigners Tuesday in a popular central Istanbul tourist area belonged to ISIS, officials said -- an attack that shows the group's nerve, reach and capacity for terror.

No group claimed responsibility for the blast, yet Turkish Prime Minister Ahmet Davutoglu pinned blame on the group that calls itself the Islamic State, which has entrenched itself in neighboring Syria and Iraq while proving willing time and again to lash out elsewhere.

At least eight Germans died in the blast between the Hagia Sophia and Blue Mosque tourist attractions in Istanbul's cultural and historic heart, German Chancellor Angela Merkel said, warning that figure may rise. A Turkish official earlier told CNN that at least nine Germans were killed. Davutoglu indicated that the 15 wounded were from inside and outside his country, with German Foreign Minister Frank-Walter Steinmeier saying nine of those were German.

"They haven't just targeted those who died," Davutoglu said. "They have targeted the whole of Turkey and the whole world."

Born in 1988, the man responsible for the blast was not among the thousands being tracked by Turkish authorities, having "newly (come) into Turkey from Syria," Deputy Prime Minister Numan Kurtulmus said.

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Just to Turkey's south, Syria has been embroiled in a civil war for nearly five years -- a conflict that, according to the United Nations, has cost more than 250,000 lives, spurred more than half the country's 17 million residents to flee and caused humanitarian crises for those left behind, as illustrated by the hundreds starving in the siege of Madaya.

Photos:The ISIS terror threat

Photos:The ISIS terror threat

Wounded passengers are treated following a suicide bombing at the Brussels Airport on March 22, 2016. The attacks on the airport and a subway killed 32 people and wounded more than 300. ISIS claims its "fighters" launched the attacks in the Belgian capital.

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Syrians gather at the site of a double car bomb attack in the Al-Zahraa neighborhood of the Homs, Syria, on February 21, 2016. Multiple attacks in Homs and southern Damascus kill at least 122 and injure scores, according to the state-run SANA news agency. ISIS claimed responsibility.

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Syrian pro-government forces gather at the site of a deadly triple bombing Sunday, January 31, in the Damascus suburb of Sayeda Zeynab. ISIS claimed responsibility for the attack, according to a statement circulating online from supporters of the terrorist group.

Wounded people are helped outside the Bataclan concert hall in Paris following a series of coordinated attacks in the city on Friday, November 13. The militant group ISIS claimed responsibility for the attacks, which killed at least 130 people and wounded hundreds more.

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Emergency personnel and civilians gather at the site of a twin suicide bombing in Beirut, Lebanon, on Thursday, November 12. The bombings killed at least 43 people and wounded more than 200 more. ISIS appeared to claim responsibility in a statement posted on social media.

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Smoke rises over the northern Iraqi town of Sinjar on November 12. Kurdish Iraqi fighters, backed by a U.S.-led air campaign, retook the strategic town, which ISIS militants overran last year. ISIS wants to create an Islamic state across Sunni areas of Iraq and Syria.

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Syrian government troops walk inside the Kweiras air base on Wednesday, November 11, after they broke a siege imposed by ISIS militants.

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Members of the Egyptian military approach the wreckage of a Russian passenger plane Sunday, November 1, in Hassana, Egypt. The plane crashed the day before, killing all 224 people on board. ISIS claimed responsibility for downing the plane, but the group's claim wasn't immediately verified.

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An explosion rocks Kobani, Syria, during a reported car bomb attack by ISIS militants on Tuesday, October 20.

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Shiite fighters, fighting alongside Iraqi government forces, fire a rocket at ISIS militants as they advance toward the center of Baiji, Iraq, on Monday, October 19.

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Smoke rises above a damaged building in Ramadi, Iraq, following a coalition airstrike against ISIS positions on Saturday, August 15.

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Iraqi men look at damage following a bomb explosion that targeted a vegetable market in Baghdad on Thursday, August 13. ISIS claimed responsibility for the attack.

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In this image taken from social media, an ISIS fighter holds the group's flag after the militant group overran the Syrian town of al-Qaryatayn on Thursday, August 6, the London-based Syrian Observatory for Human Rights reported. ISIS uses modern tools such as social media to promote reactionary politics and religious fundamentalism. Fighters are destroying holy sites and valuable antiquities even as their leaders propagate a return to the early days of Islam.

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An ISIS fighter poses with spoils purportedly taken after capturing the Syrian town of al-Qaryatayn.

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Smoke rises as Iraqi security forces bomb ISIS positions in the eastern suburbs of Ramadi, Iraq, on August 6.

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Buildings reduced to piles of debris can be seen in the eastern suburbs of Ramadi on August 6.

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The governor of the Asir region in Saudi Arabia, Prince Faisal bin Khaled bin Abdulaziz, left, visits a man who was wounded in a suicide bombing attack on a mosque in Abha, Saudi Arabia, on August 6. ISIS claimed responsibility for the explosion, which killed at least 13 people and injured nine others.

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Saudi officials and investigators check the inside of the mosque on August 6.

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Mourners in Gaziantep, Turkey, grieve over a coffin Tuesday, July 21, during a funeral ceremony for the victims of a suspected ISIS suicide bomb attack. That bombing killed at least 31 people in Suruc, a Turkish town that borders Syria. Turkish authorities blamed ISIS for the attack.

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Protesters in Istanbul carry anti-ISIS banners and flags to show support for victims of the Suruc suicide blast during a demonstration on Monday, July 20.

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People in Ashmoun, Egypt, carry the coffin for 1st Lt. Mohammed Ashraf, who was killed when the ISIS militant group attacked Egyptian military checkpoints on Wednesday, July 1. At least 17 soldiers were reportedly killed, and 30 were injured.

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Syrians wait near the Turkish border during clashes between ISIS and Kurdish armed groups in Kobani, Syria, on Thursday, June 25. The photo was taken in Sanliurfa, Turkey. ISIS militants disguised as Kurdish security forces infiltrated Kobani on Thursday and killed "many civilians," said a spokesman for the Kurds in Kobani.

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Residents examine a damaged mosque after an Iraqi Air Force bombing in the ISIS-seized city of Falluja, Iraq, on Sunday, May 31. At least six were killed and nine others wounded during the bombing.

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People search through debris after an explosion at a Shiite mosque in Qatif, Saudi Arabia, on Friday, May 22. ISIS claimed responsibility for the attack, according to tweets from ISIS supporters, which included a formal statement from ISIS detailing the operation.

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Iraqi soldiers fire their weapons toward ISIS group positions in the Garma district, west of the Iraqi capital of Baghdad, on Sunday, April 26. Pro-government forces said they had recently made advances on areas held by Islamist jihadists.

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A member of Afghanistan's security forces stands at the site where a suicide bomber on a motorbike blew himself up in front of the Kabul Bank in Jalalabad, Afghanistan, on Saturday, April 18. ISIS claimed responsibility for the attack. The explosion killed at least 33 people and injured more than 100 others, a public health spokesman said.

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Iraqi counterterrorism forces patrol in Ramadi on April 18.

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Thousands of Iraqis cross a bridge over the Euphrates River to Baghdad as they flee Ramadi on Friday, April 17.

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Yazidis embrace after being released by ISIS south of Kirkuk, Iraq, on Wednesday, April 8. ISIS released more than 200 Yazidis, a minority group whose members were killed, captured and displaced when the Islamist terror organization overtook their towns in northern Iraq last summer, officials said.

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Kurdish Peshmerga forces help Yazidis as they arrive at a medical center in Altun Kupri, Iraq, on April 8.

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A Yazidi woman mourns for the death of her husband and children by ISIS after being released south of Kirkuk on April 8. ISIS is known for killing dozens of people at a time and carrying out public executions, crucifixions and other acts.

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People in Tikrit inspect what used to be a palace of former President Saddam Hussein on April 3.

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On April 1, Shiite militiamen celebrate the retaking of Tikrit, which had been under ISIS control since June. The push into Tikrit came days after U.S.-led airstrikes targeted ISIS bases around the city.

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Iraqi security forces launch a rocket against ISIS positions in Tikrit on Monday, March 30.

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The parents of 19-year-old Mohammed Musallam react at the family's home in the East Jerusalem Jewish settlement of Neve Yaakov on Tuesday, March 10. ISIS released a video purportedly showing a young boy executing Musallam, an Israeli citizen of Palestinian descent who ISIS claimed infiltrated the group in Syria to spy for the Jewish state. Musallam's family told CNN that he had no ties with the Mossad, Israel's spy agency, and had, in fact, been recruited by ISIS.

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Iraqi Shiite fighters cover their ears as a rocket is launched during a clash with ISIS militants in the town of Al-Alam, Iraq, on Monday, March 9.

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Displaced Assyrian women who fled their homes due to ISIS attacks pray at a church on the outskirts of Damascus, Syria, on Sunday, March 1. ISIS militants abducted at least 220 Assyrians in Syria.

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Safi al-Kasasbeh, right, receives condolences from tribal leaders at his home village near Karak, Jordan, on Wednesday, February 4. Al-Kasasbeh's son, Jordanian pilot Moath al-Kasasbeh, was burned alive in a video that was recently released by ISIS militants. Jordan is one of a handful of Middle Eastern nations taking part in the U.S.-led military coalition against ISIS.

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A Kurdish marksman looks over a destroyed area of Kobani on Friday, January 30, after the city had been liberated from the ISIS militant group. The Syrian city, also known as Ayn al-Arab, had been under assault by ISIS since mid-September.

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Kurdish people celebrate in Suruc, Turkey, near the Turkish-Syrian border, after ISIS militants were expelled from Kobani on Tuesday, January 27.

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Collapsed buildings are seen in Kobani on January 27 after Kurdish forces took control of the town from ISIS.

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Junko Ishido, mother of Japanese journalist Kenji Goto, reacts during a news conference in Tokyo on Friday, January 23. ISIS would later kill Goto and another Japanese hostage, Haruna Yukawa.

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ISIS militants are seen through a rifle's scope during clashes with Peshmerga fighters in Mosul, Iraq, on Wednesday, January 21.

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An elderly Yazidi man arrives in Kirkuk after being released by ISIS on Saturday, January 17. The militant group released about 200 Yazidis who were held captive for five months in Iraq. Almost all of the freed prisoners were in poor health and bore signs of abuse and neglect, Kurdish officials said.

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Smoke billows behind an ISIS sign during an Iraqi military operation to regain control of the town of Sadiyah, about 95 kilometers (60 miles) north of Baghdad, on Tuesday, November 25.

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Fighters from the Free Syrian Army and the Kurdish People's Protection Units join forces to fight ISIS in Kobani on Wednesday, November 19.

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A picture taken from Turkey shows smoke rising after ISIS militants fired mortar shells toward an area controlled by Syrian Kurdish fighters near Kobani on Monday, November 3.

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Iraqi special forces search a house in Jurf al-Sakhar, Iraq, on Thursday, October 30, after retaking the area from ISIS.

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ISIS militants stand near the site of an airstrike near the Turkey-Syria border on Thursday, October 23. The United States and several Arab nations have been bombing ISIS targets in Syria to take out the militant group's ability to command, train and resupply its fighters.

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Kurdish fighters walk to positions as they combat ISIS forces in Kobani on Sunday, October 19.

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Heavy smoke rises in Kobani following an airstrike by the U.S.-led coalition on October 18.

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Cundi Minaz, a female Kurdish fighter, is buried in a cemetery in the southeastern Turkish town of Suruc on Tuesday, October 14. Minaz was reportedly killed during clashes with ISIS militants in nearby Kobani.

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Kiymet Ergun, a Syrian Kurd, celebrates in Mursitpinar, Turkey, after an airstrike by the U.S.-led coalition in Kobani on Monday, October 13.

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Alleged ISIS militants stand next to an ISIS flag atop a hill in Kobani on Monday, October 6.

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A Kurdish Peshmerga soldier who was wounded in a battle with ISIS is wheeled to the Zakho Emergency Hospital in Duhuk, Iraq, on Tuesday, September 30.

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Syrian Kurds wait near a border crossing in Suruc as they wait to return to their homes in Kobani on Sunday, September 28.

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A elderly man is carried after crossing the Syria-Turkey border near Suruc on Saturday, September 20.

Kurdish Peshmerga fighters fire at ISIS militant positions from their position on the top of Mount Zardak, east of Mosul, Iraq, on Tuesday, September 9.

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Displaced Iraqis receive clothes from a charity at a refugee camp near Feeshkhabour, Iraq, on Tuesday, August 19.

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Aziza Hamid, a 15-year-old Iraqi girl, cries for her father while she and some other Yazidi people are flown to safety Monday, August 11, after a dramatic rescue operation at Iraq's Mount Sinjar. A CNN crew was on the flight, which took diapers, milk, water and food to the site where as many as 70,000 people were trapped by ISIS. But only a few of them were able to fly back on the helicopter with the Iraqi Air Force and Kurdish Peshmerga fighters.

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Thousands of Yazidis are escorted to safety by Kurdish Peshmerga forces and a People's Protection Unit in Mosul on Saturday, August 9.

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Thousands of Yazidi and Christian people flee Mosul on Wednesday, August 6, after the latest wave of ISIS advances.

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A Baiji oil refinery burns after an alleged ISIS attack in northern Selahaddin, Iraq, on Thursday, July 31.

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A Syrian rebel fighter lies on a stretcher at a makeshift hospital in Douma, Syria, on Wednesday, July 9. He was reportedly injured while fighting ISIS militants.

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Children stand next to a burnt vehicle during clashes between Iraqi security forces and ISIS militants in Mosul on Tuesday, June 10.

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This violence can be pinned on many groups, including forces loyal to Syrian President Bashar al-Assad. Yet ISIS has been behind many of the worst atrocities there and elsewhere in the region, a fact that's made the terror group a top target for civilized countries.

A member of NATO, Turkey has increasingly been engaged in this fight -- including allowing the United States to launch strikes from Incirlik Air Base in southern Turkey and clamping down to curb more fighters from going through its territory to join the group. ISIS has responded by singling out Turkey as a primary target, and a recent issue of its Dabiq magazine had a cover showing President Recep Tayyip Erdogan alongside U.S. President Barack Obama.

And Davutoglu stressed Turkey wouldn't back down after Tuesday's attack,urging his countrymen and people worldwide to unite against this threat.

"We will continue our fight against terror with the same firm attitude," said the Prime Minister, insisting his country will continue working with the U.S.-led coalition to combat ISIS. "We will never compromise, not one single inch."

'I saw shocked tourists falling to the ground'

Tuesday's blast rattled Sultanahmet Square around 10:20 a.m. (3:20 a.m. ET) and brought a rush of ambulances and security forces to an area that would have been heavily guarded on any day.

Targeting outsiders would be in line with attacks executed or inspired by ISIS, which has enemies everywhere and has proven willing to strike those who don't subscribe to its twisted, hard-line version of Sharia law.

Turkey is a popular destination for Germans, and Germany's foreign ministry urged travelers in Istanbul "to avoid public gatherings (and) tourist attractions for now" after the attack.

The Peruvian foreign ministry said in a statement that one of its citizens is in stable condition at a hospital after being wounded.

A Norwegian citizen was taken to a nearby hospital after the incident, foreign ministry spokesman Frode Andersen told CNN.

Sajjan Gohel, international security director at the Asia-Pacific Foundation, doesn't think it's a coincidence this suicide blast happened in a square that's both a draw for tourists and significant to Turkey's history and its diverse cultural identity -- the type of place, he said, "that ISIS is so deeply opposed to."

"The type of monuments that are in Sultanahmet Square are the type that ISIS has been blowing up in Syria," Gohel told CNN. "It's seen as a place where you have a mesh of different entities. It's a real melting pot."

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Police investigate the scene of an explosion in central Istanbul on Tuesday, January 12. A suicide bomber killed 10 people and injured more than a dozen others in a popular tourist area.

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A man takes a photograph near the site of the explosion in Istanbul's historic Sultanahmet district.

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Turkish police cordon off a street in Istanbul.

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A man looks at the Blue Mosque near the site of the blast in Istanbul.

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Police investigate the scene.

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Ambulances and fire trucks gather near the site of the attack.

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People on a tram look out the window as it drives past the tourism hub where the explosion occurred.

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A police helicopter patrols over the historic Sultanahmet district.

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Germany's Merkel: 'We will persevere'

The blast comes as Turkey deals with multiple security threats -- from longstanding nemesis the Kurdistan Workers' Party, or PKK, as well as ISIS, which has taken over swaths of Syria and Iraq on its quest to form a far-reaching caliphate.

Ankara has persistently battled the PKK, which the United States and other governments have branded a terror group.

Turkey's actions against ISIS, which first emerged out of Iraq but now has its de facto capital in Syria, are more recent but have nonetheless made it a target of that terrorist group.

Its military cooperation with the United States and other NATO nations in particular has angered ISIS,said Fadi Hakura, associate fellow at Chatham House.

Tuesday's blast -- if it's confirmed to be the terror group's work -- ups the ante for Ankara, forcing it to step up its anti-ISIS fight even more, according to the Asia-Pacific Foundation's Gohel.

"An attack like this is designed to create economic, political and social consequences," Gohel told CNN. "Turkey has to realize that the pipeline that feeds ISIS from Turkey to Syria has to now be cut off, because incidents like this are not one-offs. This could be part of a series of plots."